Time reversal may refer to:
- In physics, T-symmetry - the study of thermodynamics and the symmetry of certain physical laws where the concept of time is reversed — i.e. where a mirror (reverse) transformation is applied to a forward direction time state.
- Time Reversal Signal Processing, a signal processing technique popular in acoustics, and currently being applied to electromagnetics, that results from the reversal in time of a system's response signal
- Time travel, theorised and speculative concepts about travelling physically through time
Famous quotes containing the words time and/or reversal:
“There was an artist in the city of Kouroo who was disposed to strive after perfection. One day it came into his mind to make a staff. Having considered that in an imperfect work time is an ingredient, but into a perfect work time does not enter, he said to himself, It shall be perfect in all respects, though I should do nothing else in my life.”
—Henry David Thoreau (1817–1862)
“Perversity depends on reversal and substitution.”
—Mason Cooley (b. 1927)
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